A Selenium‐Containing Polymer Donor Enables 16.9% Efficiency in Non‐Fused Electron Acceptor‐Based Organic Photovoltaic Cells

Author:

Xiao Yang12,Yao Huifeng13,Wang Jingwen12,Zhang Tao12,Chen Zhihao1,Qiao Jiawei4,Yang Ni12,Yu Yue12,Ren Junzhen12,Li Zi1,Hao Xiaotao4,Hou Jianhui12ORCID

Affiliation:

1. State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

2. University of Chinese Academy of Sciences Beijing 100049 China

3. School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China

4. School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

Abstract

AbstractOrganic photovoltaic cells (OPVs) based on non‐fused electron acceptors (nfEAs) have exhibited substantial progress in enhancing the power conversion efficiency (PCE). However, controlling the morphology of the donor/acceptor blend remains a significant challenge, making the regulation of film formation kinetics crucial. Here, by designing a new selenium‐containing polymer donor PQSe‐TCl, the pre‐aggregation behavior is modulated and finely tune the resultant morphologies. Compared with its thiophene analogue PBQx‐TCl, PQSe‐TCl exhibits a larger π–π stacking distance and weaker pre‐aggregation performance, leading to a longer film‐formation duration in the fabrication process. Consequently, the PQSe‐TCl:A4T‐16‐based device records an outstanding PCE of 16.9%, which is the highest value for fully nfEA‐based OPVs. This study highlights the importance of regulating the film‐formation kinetics for obtaining high‐efficiency nfEA‐based OPVs.

Funder

National Natural Science Foundation of China

Beijing Synchrotron Radiation Facility

Publisher

Wiley

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